WO2019042258A1 - Csi-rs measurement feedback method and device - Google Patents

Abstract

A CSI-RS measurement feedback method and device, for use in optimizing anlog precoding and digital precoding. The method comprises: a terminal device receives S CSI-RSs sent by a network device, each CSI-RS corresponding to one antenna port; and the terminal device sends M antenna ports corresponding to M CSI-RSs to a network device, and sends PMI correspond to a channel matrix H or a quantization result of the channel matrix H to the network device. Accordingly, the terminal device can select and feed back the M antenna ports corresponding to the M CSI-RSs among S antenna ports corresponding to the S CSI-RSs, to a base station, and the network device can be helped to select a weight for analog precoding; the PMI correspond to the channel matrix H or the quantization result of the channel matrix H is sent to the network device, and digital precoding is optimized.

Description

CSI-RS measurement feedback method and device

This application claims the priority of the Chinese Patent Application, filed on Aug. 28, 2017, with the application number No. 201710751755.9, entitled "CSI-RS Measurement Feedback Method and Apparatus", the entire contents of which are incorporated by reference. In this application.

Technical field

The present application relates to the field of wireless communications technologies, and in particular, to a CSI-RS measurement feedback method and device.

Background technique

In order to meet the rapid growth of mobile data, future wireless communication systems need to further improve system capacity and ensure user quality of service (QoS) requirements. Many new technologies and concepts, such as large-scale multiple input multiple output (MIMO), dense networks, etc., have been proposed to meet demand. At the same time, the communication industry has turned its attention to high-band communication. Since the millimeter wave segment has a very large bandwidth, millimeter-wave communication has become one of the technologies with potential for development in the future 5G wireless communication system.

However, in the millimeter-wave communication system, digital-analog hybrid precoding has become a research hotspot. The digital-analog hybrid architecture is a compromise between the traditional digital MIMO architecture and the pure analog architecture. On the one hand, it can reduce the power loss and reduce the hardware cost. Can provide a relatively large degree of freedom, achieve array gain and diversity gain to ensure system performance. However, in the digital-analog hybrid architecture, since the digital channel is smaller than the number of antennas, the transmitted pilot is weighted by analog precoding, and the weight of the analog precoding is generally unchanged, so the performance of the digital-analog hybrid architecture may be have influence on.

Summary of the invention

The application provides a CSI-RS measurement feedback method and device for optimizing analog precoding and digital precoding.

In a first aspect, the present application provides a CSI-RS measurement feedback method, where the method includes: receiving, by a terminal device, S channel state information reference signals CSI-RS sent by a network device, where the terminal device associates M CSI-RSs The antenna port number is sent to the network device, and the quantization result of the precoding matrix indicating the PMI or the channel matrix H corresponding to the channel matrix H is sent to the network device, where each CSI-RS corresponds to one antenna port number, and S is a positive integer. The channel matrix H corresponds to M CSI-RSs, and any one of the channel matrices H includes M elements, S>M, or S=M, where M is a positive integer.

Through the above method, the terminal device can select the M antenna port numbers corresponding to the M CSI-RSs from the S antenna port numbers corresponding to the S CSI-RSs to feed back to the base station, and can assist the network device to determine the corresponding M antenna port numbers. The weights of the M analog precodings enable the analog beams determined according to the weights of the M analog precodings to better point to the terminal equipment, thereby improving the performance of hybrid beamforming (HBF) and improving the spectrum utilization efficiency. , improve throughput. Further, the terminal device sends the quantization result of the PMI or the channel matrix H corresponding to the channel matrix H to the network device, and can assist the network device to determine the precoding matrix while optimizing the digital precoding. The result is improved spectrum utilization efficiency and improved throughput.

Optionally, the M may be configured by the network device or determined by the terminal device.

In a possible design, the M CSI-RSs are M CSI-RSs whose signal reception strengths are selected from high to low according to the signal reception strengths corresponding to the S CSI-RSs respectively.

Through the above method, the M CSI-RSs are CSI-RSs with better signal reception strength, so as to assist the network device to select the weight of the analog precoding.

In a possible design, the terminal device sends the M antenna port numbers corresponding to the M CSI-RSs to the network device, which may be, but not limited to, the following two methods:

Method 1: The terminal device transmits M antenna port numbers on the physical uplink shared channel PUSCH or PUCCH.

In one possible design, the M antenna port numbers can also be fed back to the network device in the form of a bit map.

Method 2: The terminal device sends a PMI of a first matrix corresponding to the M antenna port numbers in the first codebook, where the first codebook includes a plurality of predefined first matrices, and each first matrix corresponds to one PMI, and each of the first matrices corresponds to one PMI. The first matrix is an S×1 matrix, and the S elements in each first matrix are in one-to-one correspondence with the S antenna port numbers corresponding to the S CSI-RSs, and are in the first matrix corresponding to the M antenna port numbers. The values of the elements corresponding to the antenna port numbers are all 1, and the values of the remaining SM elements are all 0. In a possible design, the structure of the first matrix may be W=[0,1,1,...,0], and W is a matrix of S×1, where M elements are 1 and the remaining elements are 0. .

Accordingly, the present application provides a variety of possible implementations for feeding back M antenna port numbers. By using the above method 2 to feed back M antenna port numbers, only the PMI of the first matrix corresponding to the M antenna port numbers needs to be fed back, which can save uplink overhead.

In a possible design, the quantization result of the channel matrix H includes the quantized value of the modulus corresponding to the M elements included in the quantization matrix H' corresponding to the channel matrix H and the quantized value of the phase.

The quantization result of the channel matrix H is determined by the principle of throughput maximization or the principle of signal to interference plus noise ratio (SINR) maximization.

Through the above method, the uplink overhead can be effectively saved.

In a possible design, the quantization result of the channel matrix H includes the M group values, and the value of the i-th group includes the value of the i-th k _{1 and} the value of the i-th k ₂ , respectively corresponding to |h _i1 | And φ _i1 ;

among them,

Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, and M sets The values all meet the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.

Through the above method, the uplink overhead can be effectively saved.

In one possible design, the quantization result of the channel matrix H includes the quantized value |H| of the modulus of the quantization matrix H', and the phases corresponding to the M elements (φ _1,1 , . . . , φ _i,1 , ..., φ _{M, 1} ) the quantized value, the transformed phase corresponding to the Mth element to the 2nd element (ψ _M,1 ,...,ψ _i,1 ,...,ψ _{2, 1} ) the quantized value to cause the network device to recover H ₁ according to the following formula:

among them,

The diagonal array D is:

The kth Givens rotation matrix is:

Where i is a positive integer less than or equal to M, and the transformation phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively According to the channel matrix H and the diagonal matrix D, e ₁ =[1,0,...,0] _T , and I _i-2 represents an identity matrix of (i-2)×(i-2).

Through the above method, that is, the Givens transform method, the feedback amount, that is, the uplink overhead can be significantly reduced, and the total feedback amount relative to the direct feedback method can be reduced by nearly 50%.

In a possible design, the terminal device may define a codebook, and the codebook includes a plurality of predefined precoding matrices, and each precoding matrix has a corresponding PMI. The precoding matrix closest to the channel matrix H is selected by matching each precoding matrix with the channel matrix H, and the corresponding PMI is fed back.

In a possible design, the terminal device transmits the M antenna port numbers corresponding to the M CSI-RSs to the network device, and sends the quantization result of the precoding matrix indicating the PMI or the channel matrix H corresponding to the channel matrix H to the After the network device, the terminal device receives the network device to send data to the terminal device through the antenna ports corresponding to the M antenna port numbers, and the data is data encoded according to the precoding matrix.

Through the above method, the network device selects the weight of the analog precoding according to the M antenna port numbers, and determines the precoding matrix according to the PMI of the channel matrix H or the quantization result of the channel matrix H, and then the data that needs to be sent to the terminal device The precoding matrix is encoded and sent to the terminal device.

In a second aspect, the present application provides a CSI-RS measurement feedback method, where the method includes: the network device sends S CSI-RSs, and the network device receives M antenna port numbers corresponding to M CSI-RSs sent by the terminal device, and The quantization result of the PMI or the channel matrix H corresponding to the channel matrix H, wherein each CSI-RS corresponds to one antenna port number, S is a positive integer, the channel matrix H corresponds to M CSI-RSs, and the channel matrix H includes M elements , S ≥ M, M is a positive integer.

In a possible design, the M CSI-RSs are M CSI-RSs whose signal receiving strengths are selected from high to low according to the signal receiving strengths corresponding to the S CSI-RSs respectively.

In a possible design, the network device receives the M antenna port numbers corresponding to the M CSI-RSs sent by the terminal device by the following two methods:

Method 1: The network device receives M antenna port numbers corresponding to M CSI-RSs sent by the terminal device on the PUSCH or the PUCCH;

Method 2: The network device receives a PMI of a first matrix corresponding to the M antenna port numbers in the first codebook sent by the terminal device, where the first codebook includes a plurality of predefined first matrices, and each of the first matrices corresponds to one In the PMI, each of the first matrices is an S×1 matrix, and the S elements in each first matrix correspond to the S antenna port numbers corresponding to the S CSI-RSs, and correspond to the M antenna port numbers. The values of the elements corresponding to the M antenna port numbers in a matrix are all 1, and the values of the remaining SM elements are all 0.

In a possible design, the quantization result of the channel matrix H includes the quantized value of the modulus corresponding to the M elements included in the quantization matrix H' corresponding to the channel matrix H and the quantized value of the phase.

In a possible design, the quantization result of the channel matrix H includes the M group values, and the value of the i-th group includes the value of the i-th k _{1 and} the value of the i-th k ₂ , respectively corresponding to |h _i1 | And φ _i1 ;

among them,

Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, and M sets The values all meet the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.

In one possible design, the quantization result of the channel matrix H includes the quantized value |H| of the modulus of the quantization matrix H', and the phases corresponding to the M elements (φ _1,1 , . . . , φ _i,1 , ..., φ _{M, 1} ) the quantized value, the transformed phase corresponding to the Mth element to the 2nd element (ψ _M,1 ,...,ψ _i,1 ,...,ψ _{2, 1} ) the quantized value to cause the network device to recover H ₁ according to the following formula:

among them,

The diagonal array D is:

The kth Givens rotation matrix is:

Where i is a positive integer less than or equal to M, and the transformation phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively According to the channel matrix H and the diagonal matrix D, e ₁ =[1,0,...,0] ^T , and I _i-2 represents an identity matrix of (i-2)×(i-2).

In a possible design, after the network device receives the M antenna port numbers corresponding to the M CSI-RSs sent by the terminal device, and the quantization result of the PMI or the channel matrix H corresponding to the channel matrix H, the network device passes the M antennas. The antenna port corresponding to the port number transmits data to the terminal device, and the data is data encoded according to the precoding matrix.

In a third aspect, the application provides a terminal device, including: a memory, a processor, and a transceiver, where the memory stores instructions, when the instruction is executed by the processor, so that the transceiver is configured to receive S channels sent by the network device. The status information reference signal CSI-RS, wherein each CSI-RS corresponds to one antenna port number, and S is a positive integer; the transceiver is further configured to send M antenna port numbers corresponding to the M CSI-RSs to the network device, And transmitting, by the precoding matrix corresponding to the channel matrix H, the quantization result of the PMI or the channel matrix H to the network device, the channel matrix H corresponding to M CSI-RSs, and any one of the channel matrices H includes M elements, S>M, Or S=M, M is a positive integer.

Optionally, the M may be configured by the network device or determined by the terminal device.

In a possible design, the M CSI-RSs are M CSI-RSs whose signal receiving strengths are selected from high to low according to the signal receiving strengths corresponding to the S CSI-RSs respectively.

In a possible design, the transceiver is specifically configured to: send M antenna port numbers on a physical uplink shared channel PUSCH or PUCCH; or send a first matrix corresponding to M antenna port numbers in the first codebook. PMI, the first codebook includes a plurality of predefined first matrices, each first matrix corresponds to one PMI, and each first matrix is an S×1 matrix, and S elements and S in each first matrix The S antenna port numbers corresponding to the CSI-RSs are in one-to-one correspondence. In the first matrix corresponding to the M antenna port numbers, the corresponding elements of the M antenna port numbers are all 1, and the values of the remaining SM elements are Both are 0.

In a possible design, the quantization result of the channel matrix H includes the quantized value of the modulus corresponding to the M elements included in the quantization matrix H' corresponding to the channel matrix H and the quantized value of the phase.

In a possible design, the quantization result of the channel matrix H includes the M group values, and the value of the i-th group includes the value of the i-th k _{1 and} the value of the i-th k ₂ , respectively corresponding to |h _i1 | And φ _i1 ;

among them,

Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, and M sets The values all meet the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.

In one possible design, the quantization result of the channel matrix H includes the quantized value |H| of the modulus of the quantization matrix H', and the phases corresponding to the M elements (φ _1,1 , . . . , φ _i,1 , ..., φ _{M, 1} ) the quantized value, the transformed phase corresponding to the Mth element to the 2nd element (ψ _M,1 ,...,ψ _i,1 ,...,ψ _{2, 1} ) the quantized value to cause the network device to recover H ₁ according to the following formula:

among them,

The diagonal array D is:

The kth Givens rotation matrix is:

Where i is a positive integer less than or equal to M, and the transformation phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively According to the channel matrix H and the diagonal matrix D, e ₁ =[1,0,...,0] ^T , and I _i-2 represents an identity matrix of (i-2)×(i-2).

In a possible design, the transceiver is further configured to: send the M antenna port numbers corresponding to the M CSI-RSs to the network device, and indicate the PMI or the channel matrix H of the precoding matrix corresponding to the channel matrix H. After the quantized result is sent to the network device, the receiving network device sends data to the terminal device through the antenna ports corresponding to the M antenna port numbers, and the data is data encoded according to the precoding matrix.

In a fourth aspect, the application provides a network device, including: a memory, a processor, a transceiver, and a memory storing instructions, when the instruction is executed by the processor, so that the transceiver is configured to send S CSI-RSs, where Each CSI-RS corresponds to one antenna port number, and S is a positive integer. The transceiver is further configured to receive M antenna port numbers corresponding to M CSI-RSs sent by the terminal device, and PMIs or channels corresponding to the channel matrix H. The quantization result of the matrix H, wherein the channel matrix H corresponds to M CSI-RSs, the channel matrix H includes M elements, S≥M, and M is a positive integer.

In a possible design, the M CSI-RSs are M CSI-RSs whose signal receiving strengths are selected from high to low according to the signal receiving strengths corresponding to the S CSI-RSs respectively.

In a possible design, the transceiver is specifically configured to receive the M antenna port numbers corresponding to the M CSI-RSs sent by the terminal device on the PUSCH or the PUCCH, or the corresponding M in the first codebook sent by the receiving terminal device. PMI of the first matrix of the antenna port number, the first codebook includes a plurality of predefined first matrices, each first matrix corresponds to one PMI, and each first matrix is an S×1 matrix, each of the first The S elements in a matrix correspond one-to-one with the S antenna port numbers corresponding to the S CSI-RSs, and the elements corresponding to the M antenna port numbers in the first matrix corresponding to the M antenna port numbers are all 1. The value of the remaining SM elements is 0.

In a possible design, the quantization result of the channel matrix H includes the quantized value of the modulus corresponding to the M elements included in the quantization matrix H' corresponding to the channel matrix H and the quantized value of the phase.

In a possible design, the quantization result of the channel matrix H includes the M group values, and the value of the i-th group includes the value of the i-th k _{1 and} the value of the i-th k ₂ , respectively corresponding to |h _i1 | And φ _i1 ;

among them,

Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, and M sets The values all meet the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.

In one possible design, the quantization result of the channel matrix H includes the quantized value |H| of the modulus of the quantization matrix H', and the phases corresponding to the M elements (φ _1,1 , . . . , φ _i,1 , ..., φ _{M, 1} ) the quantized value, the transformed phase corresponding to the Mth element to the 2nd element (ψ _M,1 ,...,ψ _i,1 ,...,ψ _{2, 1} ) the quantized value to cause the network device to recover H ₁ according to the following formula:

among them,

The diagonal array D is:

The kth Givens rotation matrix is:

Where i is a positive integer less than or equal to M, and the transformation phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively According to the channel matrix H and the diagonal matrix D, e ₁ =[1,0,...,0] ^T , and I _i-2 represents an identity matrix of (i-2)×(i-2).

In a possible design, the transceiver is configured to: after the network device receives the M antenna port numbers corresponding to the M CSI-RSs sent by the terminal device, and the quantization result of the PMI or the channel matrix H corresponding to the channel matrix H, The data is transmitted to the terminal device through the antenna ports corresponding to the M antenna port numbers, and the data is data encoded according to the precoding matrix.

In a fifth aspect, the present application provides a CSI-RS measurement feedback apparatus, where the apparatus includes a receiving unit and a sending unit, where the receiving unit is configured to perform the receiving step performed by the terminal device in the above first aspect, and the sending unit is configured to perform The transmitting step performed by the terminal device on the one hand.

In a sixth aspect, the application provides a CSI-RS measurement feedback device, where the device includes a sending unit and a receiving unit, where the receiving unit is configured to perform the receiving step performed by the network device in the second aspect, and the sending unit is configured to perform The sending step performed by the network device in the second aspect.

In a seventh aspect, the embodiment of the present application further provides a communication system, where the communication system includes the network device of the second aspect and the terminal device of the first aspect.

In an eighth aspect, the embodiment of the present application further provides a first computer storage medium, where computer executable instructions are stored, where the computer executable instructions are used to perform the method of the foregoing first aspect of the present application, or The method of the second aspect.

In a ninth aspect, the embodiment of the present application further provides a first computer program product, the computer program product comprising a computer program stored on the first type of computer storage medium, the computer program comprising program instructions, when the program When the instructions are executed by a computer, causing the computer to perform the method of the first aspect of the present application; or the computer program product comprises a computer program stored on the second type of computer storage medium, the computer program comprising program instructions When the program instructions are executed by a computer, the computer is caused to perform the method of the second aspect of the present application.

In a tenth aspect, the present application further provides a chip, the chip comprising a processor and a memory, the processor for reading code stored in the memory to implement the method in the first aspect and each possible design, Or implement the method of the second aspect and each possible design.

DRAWINGS

1 is a flowchart of an overview of a CSI-RS measurement feedback method in the present application;

2 is a schematic structural diagram of a CSI-RS measurement feedback device in the present application;

3 is a second schematic structural diagram of a CSI-RS measurement feedback device in the present application;

4 is a schematic structural diagram of a terminal device in the present application;

FIG. 5 is a schematic structural diagram of a network device in the present application.

Detailed ways

Embodiments of the present application will be described below with reference to the accompanying drawings.

The techniques described in this application may employ wireless communication systems of various radio access technologies, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access ( Time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) access technology systems, It is also applicable to subsequent evolution systems, such as the fifth generation 5G (also known as the new radio (NR)) system.

The network element involved in the embodiment of the present application includes a network device and a terminal. The network device is an access device that the terminal accesses to the mobile communication system by using a wireless method, and may be a base station (NodeB), an evolved base station (eNodeB), a base station in a 5G mobile communication system, a base station in a future mobile communication system, or The specific technology and the specific device configuration adopted by the network device are not limited in the embodiment of the present application.

The terminal equipment may be simply referred to as a terminal, or may be a user equipment (UE), a mobile station (MS), a mobile terminal (MT), or the like. The terminal device can be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, industrial control (industrial control) Wireless terminal, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless in transport safety A terminal, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like.

Assuming that the number of antenna ports of the network device is S, in order to acquire channel information, the network device uses multiple beam transmit channel state information reference signals (CSI-RS), and the terminal device performs channel estimation according to CSI-RS. The channel estimation result quantizes and feeds back channel information. After the network device obtains the channel information, the network device pre-codes the data according to the channel information and transmits the data to the terminal device, thereby enabling the terminal device to receive the data. The weight of the analog precoding is generally the same, so it may affect the performance of the digital-analog hybrid architecture.

The present application provides a CSI-RS measurement feedback method on the basis of the above, to optimize the above process. Referring to FIG. 1, the method includes:

Step 100: The network device sends S CSI-RSs to the terminal device, where each CSI-RS corresponds to one antenna port number, and S is a positive integer.

Step 110: The terminal device sends the M antenna port numbers corresponding to the M CSI-RSs to the network device according to the S CSI-RSs sent by the network device, and indicates a precoding matrix indicator corresponding to the channel matrix H. The quantized result of the PMI) or the channel matrix H is sent to the network device. The channel matrix H corresponds to M CSI-RSs, that is, the channel matrix H is determined according to M CSI-RSs, and any row in the channel matrix H includes M elements, that is, corresponding to M transmit antenna ports, S>M, Or S=M, M is a positive integer. Alternatively, any of the columns of the channel matrix H includes M elements, ie, corresponding to M transmit antenna ports. Optionally, the M may be configured by the network device or determined by the terminal device.

In a possible design, the M CSI-RSs are M CSI-RSs whose signal receiving strengths are selected from high to low according to the signal receiving strengths corresponding to the S CSI-RSs respectively. Through the above method, the M CSI-RSs are CSI-RSs with better signal receiving strength, so that the auxiliary network device selects the weights of the analog precoding, so that the M analog beams corresponding to the M antenna port numbers can better point to the terminal. device.

Here, the signal reception strength may refer to reference signal receiving power (RSRP), which is one of the key parameters representing the strength of the wireless signal and one of the physical layer measurement requirements, and is all resources that carry the reference signal within a certain symbol. The average of the received signal power on the resource element (RE).

For the step 110, in a possible design, the terminal device sends the M antenna port numbers corresponding to the M CSI-RSs to the network device, which may be, but not limited to, the following methods:

Method 1: The terminal device directly transmits M antenna port numbers on a physical uplink shared channel (PUSCH) or a physical uplink control channe (PUCCH).

For example, the serial number of the S antenna ports is 1, 2, ..., S, and the terminal device may feed back M antenna port numbers to the network device on the PUSCH or PUCCH; or may feed back the number M of the antenna port number and the corresponding each. The antenna port number is given to the network device.

For example, the M antenna port numbers can also be fed back to the network device in the form of a bit map.

Method 2: The terminal device sends a PMI of a first matrix corresponding to the M antenna port numbers in the first codebook, where the first codebook includes a plurality of predefined first matrices, and each first matrix corresponds to one PMI, and each of the first matrices corresponds to one PMI. The first matrix is an S×1 matrix, and the S elements in each first matrix are in one-to-one correspondence with the S antenna port numbers corresponding to the S CSI-RSs, and are in the first matrix corresponding to the M antenna port numbers. The values of the elements corresponding to the antenna port numbers are all 1, and the values of the remaining SM elements are all 0.

Specifically, the structure of the first matrix may be W=[0, 1, 1, . . . , 0], and W is a matrix of S×1, wherein M elements are 1 and the remaining elements are 0.

For example, the terminal device selects M CSI-RSs whose signal reception strength is high to low, determines the corresponding first matrix W, and feeds back the corresponding PMI to the network device.

Therefore, by using the above method 2 to feed back M antenna port numbers, it is only necessary to feed back the PMI of the first matrix corresponding to the M antenna port numbers, which can save uplink overhead.

Further, after the terminal determines M CSI-RSs from the S CSI-RSs, the terminal determines a corresponding channel matrix H according to the M CSI-RSs, and further obtains a quantization result of the channel matrix H. The quantization result of the channel matrix H in the present application may be in the following two forms.

The first form: the quantization result of the channel matrix H includes the quantized value of the modulus corresponding to the M elements included in the quantization matrix H' corresponding to the channel matrix H and the quantized value of the phase.

In a possible design, the quantization result of the channel matrix H includes the M group values, and the value of the i-th group includes the value of the i-th k _{1 and} the value of the i-th k ₂ , respectively corresponding to |h _i1 | And φ _i1 , where

Where a represents the minimum value of the quantization, b represents the maximum value of the quantization, B _amp represents the number of quantization bits of |h _i1 |, B _φ represents the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, and the channel matrix H The quantized result is determined by using the principle of throughput maximization or the principle of maximizing signal to interference plus noise ratio (SINR). The present application does not relate to the improvement of the foregoing principles, and details are not described herein again.

The second form: the quantization result of the channel matrix H includes the quantized value |H| of the modulus of the quantization matrix H', and the phases corresponding to the M elements (φ _1,1 ,...,φ _i,1 ,.. ., the quantized value of φ _M,1 ), the transform phase corresponding to the Mth element to the second element (ψ _M,1 ,...,ψ _i,1 ,...,ψ _2,1 ) Quantize the value so that the network device recovers H ₁ according to the following formula:

Among them, the diagonal array D is:

The kth Givens rotation matrix is:

Where i is a positive integer less than or equal to M, and the transformation phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively According to the channel matrix H and the diagonal matrix D, e ₁ =[1,0,...,0] _T , and I _i-2 represents an identity matrix of (i-2)×(i-2).

For example, ψ _i,1 is calculated by the channel matrix H, and the calculation method is not limited. For example, let x _{1 be} equal to the element on the first row and the first column of the matrix D ^T H , and x ₂ is equal to the element on the second row and the first column of D ^T H

It should be noted that the calculation method of ψ _{i, 1} is not limited in this application.

Therefore, the Givens transform method can significantly reduce the amount of feedback, that is, the uplink overhead, and the total feedback amount of the first method relative to direct feedback can be reduced by nearly 50%.

Therefore, the terminal can obtain the quantization result of the channel matrix H in any of the above two forms and send it to the network device.

In a possible design, the terminal device may define a codebook, and the codebook includes a plurality of predefined precoding matrices, and each precoding matrix has a corresponding PMI. The precoding matrix closest to the channel matrix H is selected by matching each precoding matrix with the channel matrix H, and the corresponding PMI is fed back.

For example, the terminal quantizes the channel matrix H using a codebook similar to that in LTE release 10, 12, 13, 14 in which the PMI corresponding to the precoding matrix closest to the channel matrix H is selected.

Further, after step 110, in a possible design, the terminal device receives the network device to send data to the terminal device through the antenna ports corresponding to the M antenna port numbers, and the data is data encoded according to the precoding matrix.

Specifically, the network performs analog precoding on the transmit beams corresponding to the M antenna port numbers, and obtains a precoding matrix according to the PMI corresponding to the channel matrix H or the quantization result of the channel matrix H. Then, the network device sends data to the terminal device through the antenna ports corresponding to the M antenna port numbers, and the data is data encoded according to the precoding matrix.

In the present application, the network device transmits S CSI-RSs corresponding to the S antenna ports to the terminal device through the S antenna ports. The terminal device measures S CSI-RSs sent by the S antenna ports, and selects antenna port numbers of the M antenna ports corresponding to the M CSI-RSs, that is, M antenna port numbers, and the terminal device feeds back M antennas. The port number, the quantization result of the PMI or channel matrix H corresponding to the channel matrix H. The channel matrix H is determined based on M CSI-RSs. The network device determines the weights of the M analog precodings according to the M antenna port numbers, and determines the analog beam according to the weights of the M analog precodings, so that the analog beam can better point to the terminal device, and further, the network device is configured according to The quantization result of the PMI or the channel matrix H corresponding to the channel matrix H is obtained as a precoding matrix, and the data is transmitted to the terminal device through the antenna ports corresponding to the M antenna port numbers, wherein the data transmitted by the network device to the terminal device is according to the precoding matrix. Encoded data. Therefore, the method provided by the present application can improve throughput and improve spectrum utilization efficiency.

Based on the above embodiment, the embodiment of the present application provides a CSI-RS measurement feedback device, and a corresponding terminal device, for implementing the method shown in FIG. 1. Referring to FIG. 2, the CSI-RS measurement feedback device 200 is provided. The receiving unit 201 and the transmitting unit 202 are included. The receiving unit 201 is configured to receive S CSI-RSs sent by the network device, and the sending unit 202 is configured to: correspond to the M CSI-RSs according to the S CSI-RSs sent by the network device received by the receiving unit 201. The M antenna port numbers are transmitted to the network device, and the quantized result of the PMI or channel matrix H corresponding to the channel matrix H is transmitted to the network device. For details, refer to the method embodiment shown in FIG. 1 , which is not described herein again.

Based on the above embodiment, the embodiment of the present application provides a CSI-RS measurement feedback device, corresponding to a network device, for implementing the method shown in FIG. 1. Referring to FIG. 3, the CSI-RS measurement feedback device 300 is provided. The transmission unit 301 and the receiving unit 302 are included. The sending unit 301 is configured to send S CSI-RSs, and the receiving unit 302 is configured to receive M antennas corresponding to the M CSI-RSs sent by the terminal device according to the received CSI-RSs sent by the network device. The port number, and the quantization result of the PMI or channel matrix H corresponding to the channel matrix H. For details, refer to the method embodiment shown in FIG. 1 , which is not described herein again.

The channel matrix H corresponds to M CSI-RSs, that is, the channel matrix H is determined according to M CSI-RSs, and any row in the channel matrix H includes M elements, that is, corresponding to M transmit antenna ports, S>M, Or S=M, M is a positive integer. Alternatively, any of the columns of the channel matrix H includes M elements, ie, corresponding to M transmit antenna ports.

It should be understood that the division of each unit of the terminal device and the network device is only a division of a logical function, and may be integrated into one physical entity or physically separated in whole or in part. Moreover, these units may all be implemented in the form of software by means of processing component calls; or may be implemented entirely in hardware; some units may be implemented in software in the form of processing component calls, and some units may be implemented in hardware. For example, the processing unit may be a separately set processing element, or may be integrated in a certain chip. Alternatively, it may be stored in a memory in the form of a program, and a function of the unit is called and executed by a certain processing element. The implementation of other units is similar. In addition, all or part of these units can be integrated or implemented independently. The processing elements described herein can be an integrated circuit that has signal processing capabilities. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software. In addition, the above receiving unit is a unit for controlling reception, and can receive information through a receiving device of a terminal device or a network device, such as an antenna and a radio frequency device. The above sending unit is a unit for controlling transmission, and can transmit information through a transmitting device of a terminal device or a network device, such as an antenna and a radio frequency device.

For example, the above units may be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), or one or more digital signal processors ( Digital singnal processor (DSP), or one or more Field Programmable Gate Array (FPGA). As another example, when one of the above units is implemented in the form of a processing component scheduler, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can invoke the program. As another example, these units can be integrated and implemented in the form of a system-on-a-chip (SOC).

Based on the above embodiment, the embodiment of the present application further provides a terminal device, which is used to implement the method shown in FIG. 1. Referring to FIG. 4, the terminal device 400 includes: a transceiver 401, a processor 402, and a memory. 403, wherein the functions of the receiving unit 201 and the transmitting unit 202 in FIG. 2 described above are implemented by the transceiver 401.

The memory 403 is configured to store programs, instructions, and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 403 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The processor 402 executes the application program stored in the memory 403, so as to implement the method shown in FIG. 1 . For details, refer to the method embodiment shown in FIG. 1 , which is not described herein again.

Based on the above embodiment, the embodiment of the present application further provides a network device, which is used to implement the method shown in FIG. 1. Referring to FIG. 5, the terminal device 500 includes: a transceiver 501, a processor 502, and a memory. 503, wherein the functions of the transmitting unit 301 and the receiving unit 302 in FIG. 3 can be implemented by the transceiver 501.

The memory 503 is configured to store programs, instructions, and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 503 may include a RAM, and may also include a non-volatile memory, such as at least one disk storage. The processor 502 executes the application program stored in the memory 503, so as to implement the method shown in FIG. 1 . For details, refer to the method embodiment shown in FIG. 1 , which is not described herein again.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims (21)

1. A channel state information reference signal CSI-RS measurement feedback method, characterized in that the method comprises:

   Receiving S channel state information reference signals CSI-RS from the network device, where each CSI-RS corresponds to one antenna port number, and S is a positive integer;

   Transmitting M antenna port numbers corresponding to the M CSI-RSs to the network device, and transmitting, to the network device, a precoding matrix indicating PMI corresponding to the channel matrix H or a quantization result of the channel matrix H, The channel matrix H corresponds to the M CSI-RSs, and any one of the channel matrices H includes M elements, S>M, or S=M, and M is a positive integer.
2. The method according to claim 1, wherein the M CSI-RSs are M CSIs whose signal reception strengths are selected according to signal reception strengths corresponding to the S CSI-RSs respectively. RS.
3. The method according to claim 1 or 2, wherein the M antenna port numbers corresponding to the M CSI-RSs are sent to the network device, including:

   Transmitting the M antenna port numbers on a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH; or

   Transmitting a PMI of the first matrix corresponding to the M antenna port numbers in the first codebook, where the first codebook includes a plurality of predefined first matrices, each first matrix corresponding to one PMI, each of the first a matrix is an S×1 matrix, and S elements in each first matrix are in one-to-one correspondence with S antenna port numbers corresponding to the S CSI-RSs, and the corresponding M antenna port numbers are corresponding to The elements corresponding to the M antenna port numbers in the first matrix each have a value of 1, and the remaining SM elements have a value of 0.
4. The method according to any one of claims 1-3, wherein the quantized result of the channel matrix H comprises a modulus corresponding to each of the M elements included in the quantization matrix H' corresponding to the channel matrix H A quantized value of the quantized value and phase.
5. The method according to any one of claims 1 to 4, wherein the quantized result of the channel matrix H includes M sets of values, and the i-th set of values includes the value of the i-th k ₁ and the ith The values of k ₂ correspond to |h _i1 | and φ _i1 , respectively;

   among them,

   

   

   

   Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, said M The value of the group satisfies the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.
6. The method according to any one of claims 1 to 3, wherein the quantized result of the channel matrix H includes a quantized value |H| of a modulus value of the quantization matrix H', and a phase corresponding to each of the M elements The quantized value of (φ _1,1 ,...,φ _i,1 ,...,φ _M,1 ), the transform phase corresponding to the Mth element to the second element (ψ _M,1 ,...,量化_i,1 ,...,ψ _2,1 ) quantized values, such that the network device recovers H ₁ according to the following formula:

   

   among them,

   

   The diagonal array D is:

   

   The kth Givens rotation matrix is:

   

   Where i is a positive integer less than or equal to M, and the transform phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively according to the channel The matrix H and the diagonal matrix D are obtained, e ₁ =[1,0,...,0] ^T , and I _i-2 represents an identity matrix of (i-2)×(i-2).
7. The method according to any one of claims 1 to 6, wherein the M antenna port numbers corresponding to the M CSI-RSs are transmitted to the network device, and the precoding of the channel matrix H is performed. After the matrix indicates that the PMI or the quantization result of the channel matrix H is sent to the network device, the method further includes:

   Receiving data from antenna ports corresponding to the M antenna port numbers of the network device, where the data is data encoded according to the precoding matrix.
8. A channel state information reference signal CSI-RS measurement feedback method, characterized in that the method comprises:

   Sending S CSI-RSs, where each CSI-RS corresponds to one antenna port number, and S is a positive integer;

   Receiving M antenna port numbers corresponding to M CSI-RSs from the terminal device, and a PMI corresponding to the channel matrix H or a quantization result of the channel matrix H, wherein the channel matrix H corresponds to the M CSI-RSs The channel matrix H includes M elements, S≥M, and M is a positive integer.
9. The method according to claim 8, wherein the M CSI-RSs are signal reception strengths selected by the terminal device according to signal reception strengths corresponding to the S CSI-RSs respectively, from high to low. M CSI-RS.
10. The method according to claim 8 or 9, wherein the network device receives the M antenna port numbers corresponding to the M CSI-RSs from the terminal device, including:

    Receiving M antenna port numbers corresponding to the M CSI-RSs sent by the terminal device on a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH; or

    Receiving, by the terminal device, a PMI of a first matrix corresponding to the M antenna port numbers in the first codebook, where the first codebook includes a plurality of predefined first matrices, and each first matrix corresponds to one PMI Each of the first matrices is an S×1 matrix, and S elements in each first matrix are in one-to-one correspondence with S antenna port numbers corresponding to the S CSI-RSs, and the corresponding M antenna ports are The elements corresponding to the M antenna port numbers in the first matrix of the number have a value of 1, and the remaining SM elements have a value of 0.
11. The method according to any one of claims 8 to 10, wherein the quantized result of the channel matrix H comprises a modulus corresponding to each of the M elements included in the quantization matrix H' corresponding to the channel matrix H A quantized value of the quantized value and phase.
12. The method according to any one of claims 8 to 11, wherein the quantization result of the channel matrix H includes M sets of values, and the i-th set of values includes the value of the i-th k1 and the i-th k2 The values correspond to |h _i1 | and φ _{i1 respectively} ;

    among them,

    

    

    

    Where a denotes the minimum value of quantization, b denotes the maximum value of quantization, B _amp denotes the number of quantization bits of |h _i1 |, B _φ denotes the number of quantization bits of φ _i1 , i is a positive integer less than or equal to M, said M The value of the group satisfies the principle of throughput maximization or the principle of maximizing the signal to interference and noise ratio.
13. The method according to any one of claims 8 to 12, wherein the quantized result of the channel matrix H comprises a quantized value |H| of a modulus of the quantization matrix H', and a phase corresponding to each of the M elements The quantized value of (φ _1,1 ,...,φ _i,1 ,...,φ _M,1 ), the transform phase corresponding to the Mth element to the second element (ψ _M,1 ,...,量化_i,1 ,...,ψ _2,1 ) Quantize the value to restore H ₁ according to the following formula:

    

    among them,

    

    The diagonal array D is:

    

    The kth Givens rotation matrix is:

    

    Where i is a positive integer less than or equal to M, and the transform phases (ψ _M,1 , . . . , ψ _i,1 , . . . , ψ _2,1 ) corresponding to the Mth element to the second element are respectively according to the channel The matrix H and the diagonal matrix D are obtained, e ₁ =[1,0,...,0] ^T , and I _i-2 represents an identity matrix of (i-2)×(i-2).
14. The method according to any one of claims 8 to 13, wherein the M antenna port numbers corresponding to the M CSI-RSs from the terminal device, and the PMI or the channel corresponding to the channel matrix H are received. After the quantized result of matrix H, it includes:

    And transmitting data to the terminal device by using antenna ports corresponding to the M antenna port numbers, where the data is data encoded according to the precoding matrix.
15. A terminal device, comprising: a transceiver, a processor, and a memory, wherein:

    The memory is configured to store a program;

    The transceiver is configured to send and receive data;

    The processor is configured to invoke and execute a program stored in the memory, and transmit and receive data through the transceiver to implement the method according to any one of claims 1 to 7.
16. A network device characterized by a transceiver, a processor and a memory, wherein:

    The memory is configured to store a program;

    The transceiver is configured to send and receive data;

    The processor is configured to invoke and execute a program stored in the memory, and transmit and receive data through the transceiver to implement the method according to any one of claims 8 to 14.
17. A communication device, comprising a processor and a memory, the processor for executing code stored by the memory, such that the communication device performs the method of any one of claims 1 to 14.
18. A communication device for performing the method according to any one of claims 1 to 14.
19. A computer storage medium characterized by storing computer instructions which, when executed, are executed as claimed in any one of claims 1 to 14.
20. A program product, characterized in that computer instructions are stored, and when the instructions are executed, the method according to any one of claims 1 to 14 is executed.
21. A communication system comprising the terminal device according to claim 15 and the network device according to claim 16.

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